Move main llvm-prof functionality into a ModulePass.  - To support using the ProfileInfo analysis results instead of accessing the    ProfileInfoLoader directly.
Move main llvm-prof functionality into a ModulePass.
 - To support using the ProfileInfo analysis results instead of accessing the
   ProfileInfoLoader directly.

 - Based on (part of) a patch by Andreas Neustifter.

 - No functionality change.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@75625 91177308-0d34-0410-b5e6-96231b3b80d8

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